Here are 18 times the future sisters-in-law wore very similar outfits.

One of their first moments of matching style came when they both tried the "Zarita" dress by Diane Von Furstenberg.

The two clearly have a matching sense of style.
WPA Pool/Frederick M. Brown/Getty Images

While they both look lovely in the Furstenberg design, they do differ slightly. Markle went for a navy blue color with a shorter length in February 2012, while Middleton wore a longer black version of the same design in November 2014. The Duchess of Cambridge loved this one so much she brought it back in November 2017.

Middleton and Markle kept it simple yet stunning in these svelte gray dresses.

A simple yet elegant choice.
Chris Jackson/Joe Scarnici/Getty Images

Middleton wore the classic look during a visit to Canada in July 2011. Markle wore a similar style of dress a year later in September 2012.

They are both known to experiment with a bold pop of color, like the deep red of these above-the-knee dresses.

Ladies in red.
WPA Pool/Alberto E. Rodriguez/Getty Images

Middleton wore this Katherine Hooker design in November 2014, while Markle wore a slightly deeper shade of red with a higher neckline in January 2016.

The two also experimented with semi-sheer looks in these black-and-white ensembles.

Sheer and stunning.
Chris Jackson/Jamie McCarthy/Getty Images

Middleton wore her Temperley London dress to the Action on Addiction Gala in October 2014. Markle went for a similar dress while attending the Novak Djokovic Foundation New York dinner in September 2013.

They brightened things up with these white lace dresses.

Middleton's dress is more of an off-white.
Chris Jackson/Jamie McCarthy/Getty Images

Markle wore a white lace dress in a fitted silhouette on the red carpet in July 2013. Middleton wore a similar style during a tour of Australia in April 2014, opting for a more off-white tone in a fit-and-flare silhouette.

The two stepped out of their comfort zone in floor-length teal gowns.

Teal isn't often seen on the red carpet.
Pool/Neilson Barnard/Getty Images

Middleton wore the color during a visit to New York City with Prince William in December 2014. Markle chose to wear the color a few months earlier in October 2014.

They proved a classic black dress is always a reliable staple.

A classic look.
Eamonn M. McCormack/Stephen Lovekin/Getty Images

Markle tried the look first in March 2015, while Middleton followed suit a year later in November 2016.

The two twinned in red yet again with these elegant flowing designs.

They both wore these almost matching dresses in 2016. Markle's made an appearance in July during an appearance on the "Today Show," and Middleton wore her red dress during a royal tour of Canada in September.

Middleton and Markle showed they could pull off the color-block trend in these bright dresses.

Markle wore her slightly more elaborate dress to a TV Guide Magazine party in November 2012. Middleton went for a simpler color scheme, wearing a blue and pink dress to the Queen's birthday celebration in June 2016.

They kept it casual-chic with matching white button-ups and fitted jeans.

Middleton looked like an angel in this dramatic gown, and Markle's navy-blue cape dress had a similar silhouette.

These dresses had similar caped designs.
Chris Jackson/WPA Pool/Getty Images

Middleton wore her pale pink Alexander McQueen gown on a trip to Norway in February, while Markle opted for Stella McCartney while attending the Queen's birthday concert in April.

The duo also proved they could put their own spin on a classic black dress.

The little black dress is a staple, even for royals.
Pool/Jeff Spicer/Getty Images

Middleton wore her Alexander McQueen dress during a trip to Paris in March 2017, while Markle wore a similar Jason Wu design in April while attending a memorial service to celebrate the life and legacy of Stephen Lawrence.

Sign up here to get INSIDER's top travel stories straight to your inbox every week.